About once every three months, for the last year, I've gotten sharp pains in my lower right abdomen, it only lasts one or two days, what is this?

?Chronic appendiciti. Could be a number of things such as chronic appendicitis from an appendicolith (stone or fecal pellet) in the appendix. It could also be a growth in the appendix or cecum, mesenteric adenitis (inflammation of the intestinal lymph nodes) or even a vascular problem. Certainly worth checking out with your physician and possibly getting a ct scan.